I have flown a fixed wing aircraft with a high quality, panel mounted GPS from Farnborough via Popham to Compton Abbas. Half way the unit lost all signals and refused to regain the signal until safely on the ground. I just carried on flying with the map and compass and didn't get distracted.
I suggest that if you are going to use a GPS, be familiar with both methods, GPS & map.
the reason for it going down half way.........GPS jamming trials which had been Notamed. GPS signals are incredibly easy to jam (so say GAPAN) so just be aware of their limitations.
Remember the old phrase, Aviate, Navigate, Communicate.